Pilot Flame Characteristics - Empire Comfort Systems VFP20IN3 series Owner's Manual

Figures 28, 30 and 32 show a correct pilot flame pattern. The correct
flame will be blue and will extend beyond the thermocouple. The
flame will surround the thermocouple just below the tip. A slight
yellow flame may occur where the pilot flame and main burner flame
meet. Figures 29, 31 and 33 show an incorrect pilot flame pattern.
The incorrect pilot flame is not touching the thermocouple. This will
cause the thermocouple to cool. When the thermocouple cools, the
heater will shut down.
MILLIVOLT PILOT
Correct Pilot Flame Pattern
THERMOPILE
THERMOCOUPLE
(LPG)
Incorrect Pilot Flame Pattern
THERMOPILE
THERMOCOUPLE
(LPG)
If pilot flame pattern is incorrect, as shown in Figure 29
• See Troubleshooting, page 36.
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PILOT FLAME CHARACTERISTICS

PILOT
THERMOCOUPLE
(NATURAL)
Figure 28
PILOT
THERMOCOUPLE
(NATURAL)
Figure 29
HYDRAULIC THERMOSTAT PILOT
Correct Pilot Flame Pattern
Incorrect Pilot Flame Pattern
If pilot flame pattern is incorrect, as shown in Figure 31
• See Troubleshooting, page 36.
Figure 30
Figure 31
Page 33